Priority Monism is the view that there exists a single fundamental concrete object, upon which all other concrete objects depend. Following Jonathan Schaffer, call this fundamental concrete object 'the cosmos' or 'the world'. Priority Pluralism is the view that more than one concrete object is fundamental. The property 'is fundamental' seems to work - if it would work at all - in the same way. The property 'is fundamental' is the property that makes an object a fundament. The property 'is fundamental' can only succeed as the fundamentality property, if it makes its bearer such that nothing else exists upon which it, the bearer, is dependent. Many philosophers consider possible worlds to be entities. The natures of these worlds are disputed. Some take them to be sets of consistent propositions; others take them to be sets of consistent sentences; others, still, take possible worlds to be collections of spatio-temporally connected objects.